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中文摘要：
在内径为0.1 m、高度为1.5 m的鼓泡床反应器中,当表观气速（ug）为0.53-7.46 cm/s时,利用双头电导探针测定了上升和下降气泡的尺寸和速率。实验结果表明：在所测试的表观气速范围内,存在3个流型区域,即安静鼓泡区、过渡区和湍流鼓泡区,3区域间转变的ug分别为2.13 cm/s和4.26 cm/s。考察了不同流型区内上升和下降气泡的尺寸和速率的轴向和径向分布：在安静鼓泡区,气泡的尺寸和速率分布均匀;而在过渡区和湍流鼓泡区,气泡的尺寸和速率随反应器轴向和径向位置的改变而发生明显的变化。相同ug下,在反应器中心,下降气泡比上升气泡尺寸小30%-40%;当ug一定,轴向高度为0.6 m（h/D=6）时,反应器中心的下降气泡比上升气泡速率小55%左右;而在无因次径向位置r/R=0.8处,下降气泡比上升气泡速率小40%左右。
英文摘要：
Bubble size and velocities rising and descending were measured by dual-tip conductivity probe in a bubble column reactor, which operated with air and water. The column was 0.1 m in diameter and 1.5 m in height. The superficial gas velocity （ug） was ranged from 0. 53 cm/s to 7.46 cm/s. The results indicated that dispersed bubble regime, transition regime and coalesced bubble regime could be observed within the experimental ug where the transition ug among these three regimes were 2.13 cm/s and 4.26 cm/s, respectively. Bubble size and velocity were homogenous in dispersed bubble regime while changed with the changes of axial and radial position in other regimes. With the fixed ug, the descending bubble size was 30%-40% less than that of rising one in the centre of the column and the descending bubble velocity was about 55% less than that of the rising one when the axial height was 0. 6 m（h/D=6）, while in r/R= 0. 8 （dimensionless radial direction）, the descending bubble velocity was about 40M lower than that of the rising one.
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